Understanding Basic Chemistry Concepts

What is the smallest part of an element that can exist?

• Molecule

• Mixture

• Atom

• Compound

Which of the following is a correct word equation for the reaction between sodium and chlorine?

• Sodium + Chlorine -> Sodium Oxide

• Sodium + Chlorine -> Sodium Chloride

• Sodium + Chlorine -> Chlorine

• Sodium + Chlorine -> Sodium

Which method is used to separate an insoluble solid from a liquid?

• Crystallization

• Filtration

• Chromatography

• Simple Distillation

What is the purpose of a condenser in simple distillation?

• To crystallize the solid

• To filter the mixture

• To cool down the vapor

• To heat the mixture

What did the alpha particle scattering experiment demonstrate about the structure of the atom?

• Atoms are solid spheres

• Atoms have a positively charged nucleus

• Atoms are indivisible

• Electrons are embedded in a ball of positive charge

Who provided evidence for the existence of neutrons in the nucleus?

• Niels Bohr

• James Chadwick

• Ernest Rutherford

• Dmitri Mendeleev

What is the relative charge of a proton?

• +1

• 0

• -1

• +2

How do isotopes of the same element differ?

• Number of protons

• Chemical properties

• Number of electrons

• Number of neutrons

Which group in the periodic table contains the noble gases?

• Group 7

• Group 2

• Group 1

• Group 0

What is a characteristic property of metals?

• Low melting points

• Malleable

• Poor conductors of electricity

• Low density